I tried to install 6.0.1 on my VS4000/60 last night and discovered that the le0 ethernet was not detected by the kernel in netboot install.ram.gz
I am using the netboot loader from NetBSD 3.1 and it loads the image fine, but the kernel doesn't detect le0 and I can't continue with the install because there is no network device.
I tried the same thing with older NetBSD installs and had to go back to 3.1.1 to get one that would detect the ethernet device.